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MAX6708RKA+T

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MAX6708RKA+T

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Part Number MAX6708RKA+T
Manufacturer Maxim Integrated
Description IC SUPERVISOR MPU LV SOT23-8
Datasheet MAX6708RKA+T Datasheet
Package SOT-23-8
In Stock 3,110 piece(s)
Unit Price $ 6.0800 *
Lead Time Can Ship Immediately
Estimated Delivery Time Jun 5 - Jun 10 (Choose Expedited Shipping)
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Part Number # MAX6708RKA+T (PMIC - Supervisors) is manufactured by Maxim Integrated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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MAX6708RKA+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet MAX6708RKA+TDatasheet
PackageSOT-23-8
Series-
TypeMulti-Voltage Supervisor
Number of Voltages Monitored2
OutputPush-Pull, Push-Pull
ResetActive High/Active Low
Reset Timeout140 ms Minimum
Voltage - Threshold2.63V, Adj
Operating Temperature-40°C ~ 125°C (TA)
Mounting TypeSurface Mount
Package / CaseSOT-23-8
Supplier Device PackageSOT-23-8

MAX6708RKA+T Datasheet

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● Computers ● Controllers ● Intelligent Instruments ● Critical µP Power Monitoring ● White Goods ● Networking ● Telecommunications General Description The MAX6701–MAX6708 microprocessor (µP) supervisory circuits reduce the complexity and components required to monitor power-supply functions in µP systems. These devices significantly improve system reliability and accu- racy compared to separate ICs or discrete components. The MAX6701−MAX6708 family provides four func- tions: a reset output during power-up, power-down, and brownout conditions; an independent watchdog output that goes low if the watchdog input has not been toggled within 1.6s; a 0.62V threshold detector for power-fail warning; and an active-low manual reset input. The MAX6701–MAX6708 family offers several pinout options to accommodate a variety of multivoltage micro- processor supervision applications. The MAX6701(A)/MAX6702(A)/MAX6703(A) monitor three supply voltages (one fixed threshold and two adjustable) to drive a single reset output and include a manual reset input and a watchdog timer with an inde- pendent output. The MAX6704 monitors a single-supply voltage to drive complementary reset outputs and includes an independent adjustable power-fail-in/power- fail-out comparator, a manual reset input, and a reset- based watchdog timer. The MAX6705(A)/MAX6706(A)/ MAX6707(A) monitor a single-supply voltage to drive a single reset output and include an independent adjustable power-fail-in/power-fail-out comparator, a manual reset input, and a watchdog timer with an inde- pendent output. The MAX6708 is the same as the MAX6704 but without the watchdog timer function. See the Detailed Description for differences between non-A and A versions. Applications Features ● Small 8-Pin SOT23 Package ● Precision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V Supply Voltages ● 140ms Reset Timeout Delay ● Power-Fail Input with Independent Output; Monitor Inputs Down to 0.62V (MAX6704−MAX6708) ● Dual Adjustable Reset Input for Triple-Voltage Monitoring (MAX6701(A)/MAX6702(A)/MAX6703(A)) ● 1.6s Watchdog Timeout Period (MAX6701(A)−MAX6707(A)) ● Independent Watchdog Output (MAX6701(A)/MAX6702(A)/MAX6703(A)/ MAX6705(A)/MAX6706(A)/MAX6707(A)) ● Manual Reset Input ● Four Reset Output Stage Options Active Low Push-Pull (MAX6701(A), MAX6705(A)) Active Low Open Drain (MAX6703(A), MAX6707(A)) Active High Push-Pull (MAX6702(A), MAX6706(A)) Dual Active Low/High Push-Pull (MAX6704, MAX6708) ● Guaranteed Reset Valid to VCC = 1V ● Immune to Short Falling VCC Transients ● Low Cost, Few External Components Pin Configurations continued at end of data sheet. Ordering Information continued at end of data sheet. Insert the desired suffix letter (from the Threshold Suffix Guide table) into the blank to complete the part number. All devices must be ordered in increments of 2500 pieces. Sample stock is typically held on standard versions only. Contact factory for availability. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering. PART TEMP RANGE PIN-PACKAGE MAX6701_KA-T -40°C to +125°C 8 SOT23 MAX6701A_KA-T -40°C to +125°C 8 SOT23 WDI RST_IN2RST_IN1 ( ) ARE FOR MAX6702(A) ONLY. 1 2 8 7 WDO RESET (RESET)VCC GND MR SOT23 TOP VIEW 3 4 6 5 MAX6701(A) MAX6702(A) MAX6703(A) MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer 19-1952; Rev 4; 5/14 Pin Configurations Ordering Information Typical Operating Circuit and Selector Guide appear at end of data sheet.

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VCC .......................................................................-0.3V to +6.0V Open-Drain RESET, WDO, PFO ........................-0.3V to +6.0V Push-Pull RESET, RESET, WDO, PFO ... -0.3V to (VCC + 0.3V) MR, WDI, PFI, RST_IN1, RST_IN2 ......... -0.3V to (VCC + 0.3V) Input Current (VCC) ............................................................20mA Output Current (O, WDO) ..................................................20mA Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 8.9mW/°C above +70°C) ..........714mW Operating Temperature Range ......................... -40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range ............................ -65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C (VCC = +4.25V to +5.5V for L/M versions, VCC = +2.55V to +3.6V for the T/S/R versions, VCC = +2.1V to +2.75V for the Z/Y versions. TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range VCC TA = 0°C to +125°C 1.0 5.5 V TA = -40°C to +125°C 1.2 5.5 Supply Current MR Unconnected ICC VCC < 5.5V, no load 12 25 µAVCC < 3.6V, no load 9 20 VCC < 3.6V, no load (MAX6708 only) 6 20 VCC Reset Threshold (VCC falling) VTH MAX670_L/MAX670_AL TA = -40°C to +85°C 4.50 4.63 4.75 V TA = -40°C to +125°C 4.47 4.78 MAX670_M/MAX670_AM TA = -40°C to +85°C 4.25 4.38 4.50 TA = -40°C to +125°C 4.22 4.53 MAX670_T/MAX670_AT TA = -40°C to +85°C 3.00 3.08 3.15 TA = -40°C to +125°C 2.97 3.17 MAX670_S/MAX670_AS TA = -40°C to +85°C 2.85 2.93 3.00 TA = -40°C to +125°C 2.83 3.02 MAX670_R/MAX670_AR TA = -40°C to +85°C 2.55 2.63 2.70 TA = -40°C to +125°C 2.53 2.72 MAX670_Z/MAX670_AZ TA = -40°C to +85°C 2.25 2.32 2.38 TA = -40°C to +125°C 2.24 2.40 MAX670_Y/MAX670_AY TA = -40°C to +85°C 2.12 2.19 2.25 TA = -40°C to +125°C 2.11 2.27 Reset Threshold Temperature Coefficient ∆VTH 60 ppm/°C VCC to Reset Output Delay VCC falling at 10mV/µs 12 µs Reset Timeout Period tRP TA = -40°C to +85°C 140 200 280 ms TA = -40°C to +125°C 120 300 VCC Falling to WDO Delay MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/ MAX6706(A)/MAX6707(A) 5 µs PFI, RST_IN1, RST_IN2 Threshold VCC = 1.8V to 5.5V TA = -40°C to +85°C 602 618 634 mV TA = -40°C to +125°C 593 642 PFI Hysteresis 6 mV www.maximintegrated.com Maxim Integrated │ 2 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer Electrical Characteristics Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings

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Note 1: Over-temperature limits are guaranteed by design and not production tested. Devices are tested at TA = +25°C. Note 2: Guaranteed by design. Not production tested. (VCC = +4.25V to +5.5V for L/M versions, VCC = +2.55V to +3.6V for the T/S/R versions, VCC = +2.1V to +2.75V for the Z/Y versions. TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PFI, RST_IN1, RST_IN2 Leakage Current (Note 2) TA = -40°C to +85°C -50 +50 nA TA = -40°C to +125°C -200 +200 PFI to PFO Delay tPF 1 µs MR Input Voltage VIL 0.3 x VCC V VIH 0.7 x VCC MR Minimum Input Pulse 1 µs MR Glitch Rejection 100 ns MR to Reset Delay tMD 200 ns VCC Rising to WDO Delay MAX6701(A)/MAX6702(A)/MAX6703(A)/ MAX6705(A)/MAX6706(A)/MAX6707(A) 100 ns MR Pullup Resistance 25 50 75 kΩ Watchdog Timeout Period tWD TA = -40°C to +85°C 1.12 1.6 2.4 s TA = -40°C to +125°C 0.96 2.52 WDI Pulse Width tWDI (Note 2) 50 ns WDI Input Voltage VIL 0.3 x VCC V VIH 0.7 x VCC WDI Input Current IWDI VWDI = 0V or VCC -1 +1 µA RESET, WDO Output Low (Push-Pull or Open Drain) VOL VCC ≥ 1.0V, ISINK = 50µA, output asserted (TA = 0°C to +125°C) 0.3 VVCC ≥ 1.2V, ISINK = 100µA, output asserted 0.3 VCC ≥ 2.55V, ISINK = 1.2mA, output asserted 0.3 VCC ≥ 4.25V, ISINK = 3.2mA, output asserted 0.4 PFO Output Low (Push-Pull or Open Drain) VOL VCC ≥ 1.80V, ISINK = 200µA, output asserted 0.3 VVCC ≥ 2.55V, ISINK = 1.2mA, output asserted 0.3 VCC ≥ 4.25V, ISINK = 3.2mA, output asserted 0.4 RESET, WDO, PFO Output High (Push-Pull Only) VOH VCC ≥ 2.7V, ISOURCE = 500µA, output not asserted 0.8 x VCC V VCC ≥ 4.75V, ISOURCE = 800µA, output not asserted 0.8 x VCC RESET, WDO, PFO Output Open-Drain Leakage Current ILKG VCC > VTH, output not asserted 1.0 µA RESET Output High (Push-Pull Only) VOH VCC ≥ 1.0V, ISOURCE = 1µA, reset asserted (TA = 0°C to +125°C) 0.8 x VCC VVCC ≥ 1.2V, ISOURCE = 50µA, reset asserted 0.8 x VCC VCC ≥ 2.55V, ISOURCE = 500µA, reset asserted 0.8 x VCC VCC ≥ 4.25V, ISOURCE = 800µA, reset asserted 0.8 x VCC RESET Output Low (Push-Pull Only) VOL VCC ≥ 2.7V, ISINK = 1.2mA, reset not asserted 0.3 V VCC ≥ 4.75V, ISINK = 3.2mA, reset not asserted 0.4 www.maximintegrated.com Maxim Integrated │ 3 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer Electrical Characteristics (continued)

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(TA = +25°C, unless otherwise noted.) 0 50 150 100 250 300 200 350 0 800 1200400 1600 2000 2400 2800 3200 VCC - VOH vs. SOURCE CURRENT M AX 67 01 to c0 8 SOURCE CURRENT (µA) V C C - V OH (m V) VCC 4.25V 0 25 50 75 100 0 800 1600 2400400 1200 2000 2800 3200 OUTPUT-VOLTAGE LOW vs. SINK CURRENT M AX 67 01 to c0 7 SINK CURRENT (µA) V O L ( mV ) VCC 4.25V 0 40 80 120 160 MAXIMUM VCC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE M AX 67 01 to c0 6 RESET THRESHOLD OVERDRIVE (mV) MA XI MU M TR AN SI EN T DU RA TI ON (µ s) 0 10 20 30 40 50 60 MAX670_Y RESET OCCURS ABOVE LINE 0.95 0.98 0.97 0.96 0.99 1.00 1.01 1.02 1.03 1.04 1.05 -40 10-15 35 60 85 NORMALIZED RESET THRESHOLD vs. TEMPERATURE M AX 67 01 to c0 5 TEMPERATURE (°C) NO RM AL IZ ED R ES ET T HR ES OL D 1.70 1.65 1.60 1.55 1.50 -40 10-15 35 60 85 WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE M AX 67 01 to c0 4 TEMPERATURE (°C) W AT CH DO G TI ME OU T PE RI OD (s ) 20 15 10 5 0 -40 10-15 35 60 85 VCC TO RESET OUTPUT DELAY vs. TEMPERATURE M AX 67 01 to c0 3 TEMPERATURE (°C) V C C TO R ES ET O UT PU T DE LA Y (s) 210 205 200 195 190 -40 10-15 35 60 85 RESET TIMEOUT PERIOD vs. TEMPERATURE M AX 67 01 to c0 2 TEMPERATURE (°C) RE SE T TI ME OU T PE RI OD (m s) 0 4 12 8 16 20 -40 10-15 35 60 85 SUPPLY CURRENT vs. TEMPERATURE M AX 67 01 to c0 1 TEMPERATURE (°C) SU PP LY C UR RE NT (µ A) VCC = 5V VCC = 3.3V MAX6705(A) MAX6708 Maxim Integrated │ 4www.maximintegrated.com MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer Typical Operating Characteristics

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PIN NAME FUNCTIONMAX6701(A) MAX6702(A) MAX6703(A) MAX6704 MAX6705(A) MAX6706(A) MAX6707(A) MAX6708 1 1 1 1 MR Active-Low, Manual Reset Input, Internal 50kΩ Pullup to VCC. Pull low to force a reset. Reset remains active as long as MR is low and the reset timeout period after MR goes high. Leave unconnected or connect to VCC if unused. WDO deasserts when MR is low (MAX6701(A)/ MAX6702(A)/MAX6703(A)/ MAX6705(A)/ MAX6706(A)/ MAX6707(A) only) 2 2 2 2 VCC Supply Voltage for MAX6701–MAX6708 and Input for Primary Reset Threshold Monitor. Push-pull outputs are powered by VCC. 3 3 3 3 GND Ground — 4 4 4 PFI Power-Fail Voltage Monitor Input. High-impedance input for internal power-fail comparator. Connect this pin to an external resistive-divider network to set the reset threshold voltage; 0.62V (typ) threshold. Connect to GND or VCC when not used. — 5 5 5 PFO Power-Fail Monitor Output. Open drain or push-pull active low. PFO goes low when PFI is less than 0.62V. 6 6 6 — WDI Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer runs out and WDO is asserted. WDO is asserted low after each watchdog overflow and remains low until the watchdog timer is cleared (the reset output is not affected). The internal watchdog timer clears whenever a VCC/RST_IN1/RST_IN2 reset is asserted, the manual reset is asserted, or WDI sees a rising or falling edge. The watchdog timer remains cleared until the reset output is deasserted. On the MAX6704, RESET pulse asserts for the reset timeout period after each watchdog timeout overflow. The watchdog timer cannot be disabled. — — — 6 N.C. No Connection. Not internally connected. 7 7 7 7 RESET Active-Low Reset Output (Open Drain or Push-Pull). RESET changes from high to low when the VCC input drops below the selected reset threshold (or RST_IN1/ RST_IN2 for the MAX6701(A)/MAX6702(A)/MAX6703(A), MR is pulled low, or the watchdog triggers a reset (MAX6704 only). RESET remains low for the reset timeout period after the reset conditions are terminated. www.maximintegrated.com Maxim Integrated │ 5 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer Pin Description

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*RESET active-high for the MAX6702(A)/MAX6706(A). Detailed Description Figures 1, 2, and 3 are functional diagrams for the MAX6705(A)/MAX6706(A)/MAX6707(A), MAX6704/ MAX6708, and MAX6701(A)/MAX6702(A)/MAX6703(A), respectively. Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX6701–MAX6708 assert reset during power-up and prevent code execution errors during power-down or brownout conditions. On power-up, once VCC reaches 1V, RESET is a guaranteed logic-low of 0.4V or less. As VCC rises, RESET stays low. After VCC, RST_IN1, or RST_IN2 rise above the reset threshold, an internal timer holds RESET low for about 200ms. RESET pulses low whenever VCC dips below the reset threshold, including brownout conditions. If a brownout occurs in the middle of a previously initiated reset pulse, the pulse continues for at least another 140ms. On power-down, once VCC falls below the reset threshold, RESET stays low and is guaranteed to be 0.4V or less, until VCC drops below 1V. The MAX6702(A)/MAX6704/MAX6706(A)/MAX6708 active-high RESET output is the complement of the RESET output, and is guaranteed to be valid with VCC down to 1V. PIN NAME FUNCTIONMAX6701(A) MAX6702(A) MAX6703(A) MAX6704 MAX6705(A) MAX6706(A) MAX6707(A) MAX6708 8 — 8 — WDO Active-Low Watchdog Output (Open Drain or Push- Pull). WDO is asserted whenever the watchdog times out and VCC or the reset inputs are below their respective thresholds. WDO deasserts after a valid WDI transition without a reset timeout period. In the A versions, WDO deasserts without a timeout delay when VCC, RST_IN1, and RST_IN2 rises above its threshold. Pull MR low to assert WDO (MAX6701/MAX6702/ MAX6703/MAX6705/MAX6706/MAX6707 only). Pull MR low to deassert WDO (MAX6701(A)/MAX6702(A) / MAX6703(A)/ MAX6705(A)/MAX6706(A)MAX6707(A) only) 7* 8 7* 8 RESET Active-High Reset Output (Push-Pull). RESET changes from low to high when the VCC input drops below the selected reset threshold (or RST_IN1/RST_IN2 for MAX6701(A)/MAX6702(A)/ MAX6703(A), MR is pulled low, or the watchdog triggers a reset (MAX6704 only). RESET remains high for the reset timeout period after the reset conditions are terminated. 4 — — — RST_IN1 Input for User-Adjustable VCC2 Monitor. High- impedance input for second internal reset comparator. Connect this pin to an external resistive-divider network to set the reset threshold voltage; 0.62V (typ) threshold. Connect to VCC when not used. Reset is asserted when either VCC, RST_IN1, or RST_IN2 are below threshold. 5 — — — RST_IN2 Input for User-Adjustable VCC3 Monitor. High- impedance input for third internal reset comparator. Connect this pin to an external resistive-divider network to set the reset threshold voltage; 0.62V (typ) threshold. Connect to VCC when not used. Reset is asserted when either VCC, RST_IN1, or RST_IN2 are below threshold. www.maximintegrated.com Maxim Integrated │ 6 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer Pin Description (continued)

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Figure 4. MAX6705/MAX6706/MAX6707 RESET, MR, WDO, and WDI Timing Figure 3. MAX6701(A)/MAX6702(A)/MAX6703(A) Functional Diagram Figure 2. MAX6704/MAX6708 Functional Diagram Figure 1. MAX6705(A)/MAX6706(A)/MAX6707(A) Functional Diagram tRP tRP VCC 0V RESET WDO VCC 0V WDI VCC 0V MR MR EXTERNALLY DRIVEN LOW VCC 0V VCC VTH VTH tMD NOTE: THE MAX6706 RESET OUTPUT IS THE INVERSE OF THE RESET SHOWN. RESET GENERATOR WATCHDOG TIMER RESET (RESET) WDO WDI 0.62V 0.62V VREF MR VCC RST_IN1 RST_IN2 VCC 50kΩ MAX6701(A) MAX6702(A) MAX6703(A) ( ) ARE FOR MAX6702(A) ONLY. WATCHDOG TIMER RESET GENERATOR 8 WDI (MAX6704 ONLY) 7 6 RESET RESET 5 PFO 3 0.62V VREF VCC 50kΩ 1 MR 2VCC 4 PFI MAX6704 MAX6708 GND WATCHDOG TIMER RESET GENERATOR VCC 50kΩ 8 WDO 7 RESET (RESET) 5 PFO GND3 0.62V ( ) ARE FOR MAX6706(A) ONLY. 6 WDI 1MR 2V VREF CC 4 PFI MAX6705(A) MAX6706(A) MAX6707(A) www.maximintegrated.com Maxim Integrated │ 7 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer

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Standard- vs. A-Version Comparison The MAX6701/MAX6702/MAX6703/MAX6705/MAX6706/ MAX6707s’ WDO latches low when one of the following events occurs: ● The watchdog timer times out (1.6s, typ). ● VCC, RST_IN1, or RST_IN2 is below its reset threshold. ● MR is pulled low. ● WDO only deasserts with a valid WDI transition. The MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/ MAX6706(A)/ MAX6707(A)s’ WDO asserts when either VCC, RST_IN1, or RST_IN2 is below its reset thresh- old. WDO deasserts without a timeout delay when the undervoltage situation has expired. WDO is latched low when the watchdog timer elapses without seeing a WDI transition. WDO deasserts with a valid WDI transition OR by pulling MR low. See Figures 4 and 5 for standard-version timing. See Figures 6 and 7 for A-version timing. Watchdog Timer The MAX6701–MAX6707 watchdog circuit monitors the µP’s activity. If the µP does not toggle the WDI within 1.6s, WDO goes low. When RESET is asserted, the watchdog timer stays cleared and does not count. As soon as reset is released, the timer starts counting. WDO deasserts after a valid transition is detected at WDI. Pulses as short as 50ns can be detected. Typically, WDO is connected to the NMI input of a µP. When VCC, RST_IN1, or RST_IN2 drop below the reset threshold, WDO goes low whether or not the watchdog timer has timed out. Normally this would trigger an NMI, but RESET goes low simultaneously, and thus overrides the NMI. The MAX6704 watchdog circuit does not have an inde- pendent watchdog output (WDO). If the µP does not toggle the watchdog input within 1.6s, the MAX6704 asserts a reset output pulse for the reset timeout period. Manual Reset The manual reset input (MR) allows reset to be triggered by a pushbutton switch. The switch is effectively debounced by the reset pulse width. MR is CMOS logic compatible, so it can be driven by an external logic line. MR can be used to force a watchdog timeout to generate a reset pulse in the MAX6701(A)/MAX6702(A)/ MAX6703(A)/MAX6705(A)/MAX6706(A)/MAX6707(A) by connecting WDO to MR. Power-Fail Comparator The uncommitted power-fail comparator can be used for various purposes because its noninverting input and output are externally available. The inverting input is internally connected to a 0.62V reference. To build an early warning circuit for power failure, connect the PFI pin to a voltage-divider (see the Typical Operating Circuit). Choose the voltage-divider ratio so that the voltage at PFI falls below 0.62V just before the regulator drops out. Use PFO to interrupt the µP so it can prepare for an orderly power-down. The low-input current at this pin allows for large resistor values in the divider. Figure 6. MAX6701(A)/MAX6702(A)/MAX6703(A)/ MAX6705(A)/ MAX6706(A)/MAX6707(A) RESET, MR, and WDO Timing with WDI Three-Stated Figure 5. MAX6701/MAX6702/MAX6703/MAX6705/MAX6706/ MAX6707 Watchdog tRP tRP +5V 0V RESET WDO +5V 0V MR tMR +5V 0V VCC VTH VTH tMD tWD tWD +5V 0V WDI +5V 0V WDO +5V 0V RESET +5V 0V(RESET) tRPRESET EXTERNALLYTRIGGERED BY MR +5V 0V MR ( ) ARE FOR MAX6702/MAX6706 ONLY. tWDI www.maximintegrated.com Maxim Integrated │ 8 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer

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Reset Input The MAX6701(A)/MAX6702(A)/MAX6703(A) include two adjustable reset inputs for monitoring up to a total of three system voltages (including VCC). The thresholds for the monitored RST_IN supplies are externally set with resistor-divider networks (Figure 8). The reset output is asserted if any of the monitored supplies (VCC, RST_IN1, or RST_IN2) go below its specified threshold and remains asserted for the reset timeout period after all supplies are above their thresholds. Applications Information Ensuring a Valid RESET Output Down to VCC = 0 When VCC falls below 1V, the MAX6701–MAX6708 RESET output no longer sinks current; it becomes an open circuit. High-impedance CMOS logic inputs can drift to undetermined voltages if left undriven. If a pull- down resistor is added to the RESET pin, as shown in Figure 9, any stray charge or leakage currents are drained to ground, holding RESET low. A resistor value (R1) is not critical; 100kΩ is large enough not to load RESET and small enough to pull RESET to ground. This application works for push-pull output only (not for open-drain resets). Monitoring Other System Voltages Other systems can be monitored by connecting a voltage-divider to PFI and adjusting the ratio appropriately. In noisy systems, a capacitor between PFI and GND reduces the power-fail circuit’s sensitivity to high- frequency noise on the line being monitored. Reset can be asserted on other voltages in addition to the VCC supply line. Connect PFO to MR to initiate a reset out- put pulse when PFI drops below 0.62V. Figure 10 shows the MAX6704–MAX6708 configured to assert a reset output when the secondary supply falls below the reset threshold. Generating a Reset from Watchdog Overflow Connect WDO to MR to force a watchdog timeout to gen- erate a reset pulse for only the reset timeout period on the MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/ MAX6706(A)/MAX6707(A). When the MAX6704 watch- dog times out, reset outputs are automatically asserted (no external connections required). For the MAX6701/ MAX6702/MAX6703/MAX6705/MAX6706/MAX6707 non-A versions, do not connect WDO to MR; this creates a locked condition. Figure 8. Calculating Adjustable Voltage ThresholdsFigure 7. MAX6701(A)/MAX6702(A)/MAX6703(A)/ MAX6705(A)/ MAX6706(A)/MAX6707(A) Watchdog Timing R1 R2 0.62V PFI, RST_IN1, OR RST_IN2 VEXTERNAL 0.62 R1 = R2 x (VEXT-TH - 1)R2VEXT-TH = (1 + R1) x 0.62V WHERE VEXT-TH IS THE EXTERNAL VOLTAGE TRIP LEVEL. MAX6701(A)– MAX6708 tWD tWD tWD +5V 0V WDI +5V 0V WDO +5V 0V RESET +5V 0V(RESET) tRP +5V 0V MR ( ) ARE FOR MAX6702(A)/MAX6706(A) ONLY. tWDI www.maximintegrated.com Maxim Integrated │ 9 MAX6701-08/ MAX6701A-03A/ MAX6705A-07A Low-Voltage, SOT23 µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer

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May 22, 2020

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May 22, 2020

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May 22, 2020

The are the right size and type and do what they are designed to do.

Lin*****arey

May 10, 2020

On time and as described, fast delivery. Would definitely buy again. Thx.

Bryc*****iley

May 7, 2020

Completely satisfied of MAX6708RKA+T , I always find what I need. The site is easy to get the components .

France*****stillo

April 28, 2020

Fast, Friendly Service. Item as described. Good Communications. Thank You!

Santo*****gherty

April 24, 2020

A well designed product that fit my custom PCB's perfectly. Easy to use. Sturdy construction. Highly recommend to all PCB builders.

Marc*****Kant

April 16, 2020

Awesome components selection and availability. Ordering process is easy. They don't spam me after the purchase.

Cass*****Rubio

April 10, 2020

To be honest, I think you are doing an outstanding job.

Ros*****Sarna

April 10, 2020

Items arrived well pakaged, reasonable postage and as described. Top seller

MAX6708RKA+T Guarantees

Service Guarantee

Service Guarantees

We guarantee 100% customer satisfaction.

Our experienced sales team and tech support team back our services to satisfy all our customers.

Quality Guarantee

Quality Guarantees

We provide 90 days warranty.

If the items you received were not in perfect quality, we would be responsible for your refund or replacement, but the items must be returned in their original condition.

MAX6708RKA+T Packaging

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MAX6708RKA+T

Certified Quality

Heisener's commitment to quality has shaped our processes for sourcing, testing, shipping, and every step in between. This foundation underlies each component we sell.

ISO9001:2015, ICAS, IAF, UKAS

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Do you have any question about MAX6708RKA+T?

+86-755-83210559 ext. 811 SalesDept@heisener.com heisener007 2354944915 Send Message

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